Breast pump



FIG. 1 is a perspective view of a breast pump showing my new design;

FIG. 2 is a perspective view thereof, opposite that shown in FIG. 1;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a exploded perspective view thereof. 

The ornamental design for a breast pump, as shown. 